I mowed property today. I drove the tractor to the the field about 2 1/2 miles. My wife followed in the truck and said I was going 8 miles per hour. There was a really loud awful irregular clacking coming from the left rear axle (it seemed), It would get louder on hills and slight grades. Once I started to mow I couldn't really pick out the noise. I only heard it when I was on the pavement.
About 2 1/2 acres took just over two hours to mow. Had to raise the mower deck a bit because the weeds were a little thick, but I was able to go in second gear most of the way. I'll go back soon and cut it again with the deck all the way down. We're pretty satisfied with it so far. Here's a pic of how it looks after fixing it up for a couple weeks. Al.

I get that problem a lot with my 55 because the wheel bolts are rusted really bad and keep coming lose. I tighten them up once a week and don't hear it know. Better do it quick cause I scuffed up the rim and center pretty good letting it all bang around the first time. Good luck

Thanks for the help. I have the tractor out at the property. I went there today and found a "brand x" bolt at the rim to disc joint. I could turn it by hand. I'll replace that and test it and let you know if that fixes it. Thanks again. Al.